AN INVESTIGATION ON THE USE OF SURFACTANTS IN THE ORGANOPHILIZATION OF BENTONITE CLAY FOR OIL-BASED DRILLING FLUIDS

R. P. Silva, V. C. Santanna, J. L. M. Barillas, T. N. Castro Dantas

Abstract


Due to the challenges encountered in well drilling operations, there are continuous demands for the development of fluids with specific physical-chemical and rheological properties. Such fluids must be controlled carefully to meet all technical criteria established. In drilling operations carried out offshore and in water-sensitive formations, oil-based drilling fluids must be used. Bentonite clay can be employed in such operations, after a previous surface treatment is undertaken, to render it hydrophobic. In this work, calcic bentonite clay was modified with the purpose of enhancing its affinity for the organic phase in oil-based drilling fluids. Three different surfactants, namely, saponified coconut oil (SCO), hexadecyltrimethyl ammonium bromide (CTAB), and a nonionic ethoxylated amine (UTM 150) were examined at different concentrations. The results indicate that UTM 150 and CTAB are more efficient in the organophilization of the clay, which can then be added in the compositions of oil-based drilling fluids that are potential candidates for real applications.

Keywords


surface modification; organophilic clay; drilling fluid; surfactant; bentonite

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DOI: http://dx.doi.org/10.5419/bjpg2017-0004